TV Anytime Forum's Metadata Specification

Within the TV-Anytime environment, the most visible parts of metadata are the attractors/descriptors used e.g. in Electronic Program Guides (EPG), or in Web pages to describe content. This is the information that the consumer, or intelligent agents, will use to search and select content available from a variety of internal and external sources.
Another important set of metadata consists of describing user preferences, representing user consumption habits, and defining other information (e.g. demographics models) for targeting a specific audience.
The TV-Anytime Metadata Specification also allows describing segmented content. ...
From the TV-Anytime Metadata Specification working group, 2001

Another important set of metadata consists of describing user preferences, representing user consumption habits, and defining other information (e.g. demographics models) for targeting a specific audience.